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1.
Mem. Inst. Oswaldo Cruz ; 116: e200560, 2021. graf
Article in English | LILACS | ID: biblio-1154882

ABSTRACT

BACKGROUND Anisakis simplex antigens present immunomodulatory properties by the induction of tolerogenic dendritic cells (DCs) in mice. OBJECTIVES To study the capacity of DCs stimulated with A. simplex excretory-secretory (ES) or crude extract (CE) to generate Tregs. To investigate in vitro effects of antigens on the metabolic activity of splenocytes induced by LPS or CpG. METHODS Phenotypic and functional characterization of T cells co-cultured with A. simplex-pulsed DCs was performed by flow cytometry. Lymphocyte mitochondrial respiratory activity was estimated by the Alamar Blue® Assay. FINDINGS In C57BL/6J, CD4+CD25-Foxp3+ and CD8+CD25-Foxp3+ populations increased by CE-stimulated-DCs. In BALB/c, CE-stimulated-DCs caused the expansion of CD4+CD25+Foxp3+IL-10+ and CD8+CD25+Foxp3+IL-10+. IFN-γ expression raised in BALB/c CD4+CD25+ and CD4+CD25- for CE and ES, respectively. ES-stimulated-DCs increased CD4+CD25+ Foxp3+ and CD8+CD25- Foxp3+ expression in T cells. The association of ES or CE with LPS produced the increase in splenocyte activity in C57BL/6J. The association of CE with CpG decreased the proliferation caused by CpG in C57BL/6J. MAIN CONCLUSIONS A. simplex increase the frequency of Tregs, which in turn produce IL-10 and IFN-γ. The host genetic base is essential in the development of anti-Anisakis immune responses (Th2, Th1, Treg).


Subject(s)
Animals , Mice , Anisakis , T-Lymphocytes, Regulatory , Antigens/metabolism , Bone Marrow , Dendritic Cells , Forkhead Transcription Factors , Interleukin-2 Receptor alpha Subunit , Larva , Mice, Inbred BALB C , Mice, Inbred C57BL
2.
Rev. cuba. hematol. inmunol. hemoter ; 35(1): e927, ene.-mar. 2019.
Article in Spanish | LILACS, CUMED | ID: biblio-1003884

ABSTRACT

La leucemia linfoide crónica (LLC) es una neoplasia maligna que afecta principalmente a pacientes de mediana edad y ancianos. Se caracteriza por la proliferación de linfocitos morfológicamente maduros pero inmunoincompetentes que se acumulan en sangre periférica, médula ósea y tejido linfático. Presenta gran heterogeneidad clínica. Se describen diversos fenotipos, aunque predomina la expansión clonal de células B CD5+CD23+. Los factores pronósticos en la LLC incluyen el subgrupo citogenético, estado mutacional de inmunoglobulina, la expresión de ZAP-70, CD38 y CD49d. El tratamiento se basa en usar modernos algoritmos terapéuticos aprobados, que produzcan mayores respuestas y menores eventos secundarios, en lograr la remisión clínica completa y mejorar la calidad de vida de estos pacientes(AU)


Chronic lymphocytic leukemia (CLL) is a malignancy that mainly affects middle-aged and elderly patients. It is characterized by the proliferation of morphologically mature but immunoincompetent lymphocytes that accumulate in blood, bone marrow and lymphatic tissue. It presents great clinical heterogeneity. Several phenotypes are described, although the clonal expansion of CD5 + CD23 + B cells predominates. Prognostic factors include the cytogenetic subgroup, immunoglobulin mutational status, expression of ZAP-70, CD38, and CD49d. The treatment is based on using modern approved therapeutic algorithms that produce greater responses and minor secondary events, to achieve complete clinical remission and to improve the quality of life of these patients(AU)


Subject(s)
Humans , Leukemia, Lymphoid/genetics , Immunophenotyping/methods , Prognosis , Leukemia, Lymphoid/etiology , Flow Cytometry/methods , Antigens/metabolism
3.
Salvador; s.n; 2014. 56 p. ilus, tab.
Thesis in Portuguese | LILACS | ID: biblio-1000951

ABSTRACT

A candidíase é uma infecção oportunista provocada por diversas espécies de fungos do gênero Candida, frequentemente encontrados integrando a microbiota, da superfície cutânea, no trato gastrointestinal e cavidades mucosas do ser humano desde o seu nascimento. A incidência das infecções fúngicas sistêmicas têm aumentado consideravelmente nas últimas décadas em função do grande número de pacientes com SIDA, a grande quantidade de transplantes e condições crônicas como o câncer, a terapia prolongada com imunossupressores e o uso de agentes corticosteroides. Além disso, a exposição prolongada aos antifúngicos azólicos promove a seleção de patógenos resistentes. No presente estudo avaliou-se a atividade antifúngica do complexo Rutênio-pirocatecol (RPC) frente a um isolado clinico de Candida tropicalis resistente ao fluconazol. A metodologia empregada para os testes de susceptibilidade foi de acordo com o documento M27-A3 do National Committee for Clinical Laboratory Standards (NCCLS, 2008). Esplenócitos de camundongos Balb/c foram obtidos de forma asséptica para avaliar a citotoxicidade do composto para células de mamíferos. O estresse oxidativo promovido pelo composto foi avaliado através da reação ao ácido tiobarbitúrico (TBARS) e ensaios de fluorescência com a sonda diclorodihidrofluoresceína diacetato (DCFH2DA). O Calcofluor White foi empregado para avaliar a integridade da parede celular. A análise ultraestrutural foi realizada através da microscopia eletrônica de varredura e transmissão. Os resultados encontrados para os testes de atividade antifúngica foram analisados através do teste estatístico ANOVA e pós-teste Dunnett. Os resultados encontrados para os testes de atividade antifúngica do RPC mostraram uma Concentração Inibitória de 50% (IC50) de 20,3 μM, enquanto em esplesnócitos a concentração efetiva de 50% foi de 325 μM mostrando um índice de seletividade igual a 16...


Candidiasis is an opportunistic infection caused by several species of fungi of the genus Candida, often found is the microbiota, on the skin, gastrointestinal tract and mucous cavities of the human beings birth. The incidence of systemic fungal infections have increased considerably in recent decades due to the large number of AIDS patients, the large number of transplants and chronic conditions such as cancer, prolonged therapy promotes the selection of resistant pathogen with immunosuppressant and corticosteroid agents. Also prolonged exposure azole antifungals to make them strong candidates for patients resistance. In the present study we evaluated the antifungal activity of Ruthenium-pyrocatechol complex (RPC) against a clinical isolate of Candida tropicalis resistant to fluconazole. The methodology for susceptibility testing was in accordance with the M27-A3 document of there National Committee for Clinical Laboratory Standards (NCCLS, 2008). Splenocytes from Balb/c mice were obtained aseptically to evaluate the cytotoxicity of the compound to mammalian cells. Oxidative stress caused by the compound was assessed by reaction to thiobarbituric acid (TBARS) and fluorescence assays with the probe diclorodihidrofluoresceína diacetate (DCFH2DA). The Calcofluor White was used to evaluate the integrity of the cell wall. The ultrastructural analysis was performed by scanning and transmission electron microscopy. The results for the antifungal activity tests were analyzed using ANOVA and pos-test Dunnett test statistic. The results for the tests of antifungal activity of the RPC showed a 50% inhibitory concentration (IC50) of 20.3 μM while in splenocytes the 50% effective concentration was 325 μM showing a selectivity index of 16...


Subject(s)
Humans , Antigens/analysis , Antigens/metabolism , Fluconazole , Fluconazole/analysis , Fluconazole/immunology , Fluconazole/chemical synthesis , Sirolimus , Sirolimus/analysis , Sirolimus/adverse effects , Sirolimus/supply & distribution
4.
Article in Korean | WPRIM | ID: wpr-108489

ABSTRACT

BACKGROUND: It has been demonstrated that flow cytometric detection of minimal residual disease (MRD) has a prognostic significance in the treatment of patients with acute leukemia. We investigated the significance of flow cytometric MRD detection for the first time in Korea. METHODS: We analyzed the results of MRD detection in morphologically complete remission bone marrow aspirates from 89 patients with newly-diagnosed or relapsed acute leukemia, in which leukemic cells had cross-lineage antigen expression. Patients were grouped based on MRD frequencies: > or =1.0%, high MRD; <1.0%, low MRD. RESULTS: Forty-seven ALL patients consisted of 10 with high and 37 with low MRD levels. Patients with high MRD levels showed a tendency of more frequent relapse than those with low MRD levels (40.0% and 13.5%, respectively) (P=0.08). High MRD group showed a tendency of short relapse-free survival (RFS) and overall survival (OS), although the differences were not statistically significant. Forty-two AML patients consisted of 16 with high and 26 with low MRD levels. There were no correlations between the MRD levels and relapse rate, RFS or OS. AML patients with high MRD levels showed significantly higher rate of unfavorable cytogenetic risk categories and lower rate of favorable risk categories (P=0.03). CONCLUSIONS: MRD detection by flow cytometric assay of cross-lineage antigen expression would be useful in predicting treatment outcome in patients with ALL rather than AML. We expect that the establishment of the standardization of methods, time to test or antibody combination would be achieved through further trials in this country.


Subject(s)
Acute Disease , Adolescent , Adult , Aged , Antigens/metabolism , Antigens, CD/metabolism , Bone Marrow/metabolism , Child , Child, Preschool , Disease-Free Survival , Female , Flow Cytometry , Humans , Infant , Leukemia, Myeloid, Acute/diagnosis , Male , Middle Aged , Neoplasm, Residual/diagnosis , Precursor Cell Lymphoblastic Leukemia-Lymphoma/diagnosis , Recurrence , Survival Rate
5.
Article in English | WPRIM | ID: wpr-9058

ABSTRACT

We investigated the characteristic features of cervical lymph node B cells to determine whether their behavior differs from that of B cells located elsewhere, because cervical lymph nodes may be exposed to continual antigenic stimulation from the naso- and/or oropharynx. B cells were isolated from cervical lymph nodes, spleen and peritoneal fluid of mice, cultured in medium, and exposed to various stimuli. The expression of various surface molecules characteristic of lymphoid B cells was assayed by flow cytometry, and immunoglobulin secreted into the culture supernatants was evaluated by enzyme-linked immunosorbent assay. B220+ cells were cultured in medium alone or with lipopolysaccharide, and their entrance into S phase in response to stimuli was measured by proliferative assays. Phenotypic characteristics of cervical lymph node B cells included CD5low, CD23high, CD43low, B7.1low, B7.2low, and Syndecan-1low. Unstimulated lymphoid B cells did not secrete immunoglobulin, but, upon stimulation, secretion of IgM was increased more than secretion of IgA and IgG. B cells actively entered S phase after 48 hr stimulation. These results show that B cells in cervical lymph nodes are conventional B2 cells, like splenic B cells.


Subject(s)
Spleen/cytology , Phenotype , Mice, Inbred BALB C , Mice , Male , Lymph Nodes/cytology , Immunoglobulin M/chemistry , Flow Cytometry , Enzyme-Linked Immunosorbent Assay , Culture Media/pharmacology , Cell Proliferation , Cell Culture Techniques/methods , B-Lymphocytes/cytology , Antigens/metabolism , Animals
6.
Genet. mol. res. (Online) ; 2(1): 102-111, Mar. 2003.
Article in English | LILACS | ID: lil-417620

ABSTRACT

Lactic acid bacteria (LAB), widely used in the food industry, are present in the intestine of most animals, including humans. The potential use of these bacteria as live vehicles for the production and delivery of heterologous proteins of vaccinal, medical or technological interest has therefore been extensively investigated. Lactococcus lactis, a LAB species, is a potential candidate for the production of biologically useful proteins. Several delivery systems have been developed to target heterologous proteins to a specific cell location (i.e., cytoplasm, cell wall or extracellular medium). A promising application of L. lactis is its use as an antigen delivery vehicle, for the development of live mucosal vaccines. The expression of heterologous proteins and antigens as well as the various delivery systems developed in L. lactis, and its use as an oral vaccine carrier are discussed


Subject(s)
Animals , Genetic Vectors , Lactococcus lactis/genetics , Vaccines , Antigens/genetics , Antigens/metabolism , Cytokines/genetics , Cytokines/metabolism , Gene Expression Regulation , Immunity, Mucosal , Lactococcus lactis/metabolism , Mice , Recombinant Proteins/genetics , Recombinant Proteins/metabolism
9.
Article in English | IMSEAR | ID: sea-23461

ABSTRACT

Obligate carriers of haemophilia A and normal women matched for age were studied in order to find a suitable parameter for detection of carriers of haemophilia A. The ratio of factor VIII coagulant activities (F VIIIC) to factor VIII related antigen (F VIII R : Ag) was 0.55 in obligate carriers and 1.0 in non-carrier females.


Subject(s)
Adult , Antigens/metabolism , Factor VIII/immunology , Female , Hemophilia A/blood , Genetic Carrier Screening , Humans , Male , Partial Thromboplastin Time , von Willebrand Factor/metabolism
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